Town of Beloit police said the mother's half-sister, Kristen Smith, was taken into custody in Iowa on Thursday on an unrelated warrant. She had been at the family home in Beloit and said she was on her way back to her home in Colorado when Kayden disappeared.

Police said they called Smith on her cellphone, and she agreed to pull over in Iowa. Police said she had baby clothing in her car, but there was no sign of the newborn.

Authorities are currently holding Smith on an unrelated warrant but now call her a person of interest in this case.

Kopp said Kayden was found "in the general area" where Smith pulled over to await police on Thursday.

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